The reaction of 1,4-bis(diisopropylphenyl)-aza-1,4-butadienenickel dibromide ( 1a ) with stoichiometric amounts of phenyl Grignard or trimethylaluminum affords the purple Ni(I) complexes 1b and 1c, respectively. Single-crystal X-ray diffraction reveals dinuclear species in the solid state for both compounds. UV/vis spectroscopy supports this rare oxidation state of nickel.
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Meinhard et al. (2007) studied this question.
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